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CBSE-IX-Foundation percent 252520of%252520Information%252520Technology%252520.

02: Computer System Organisation

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  • Qstn #8
    Explain secondary memory. Give some examples of secondary memory.
    Ans : It is also known as Secondary Storage or Auxiliary Memory. It is slower and cheaper form of memory, which is a permanent storage device. CPU does not access the secondary memory directly. The contents in it must be first copied into the RAM to get processed.
    It is non-volatile in nature, i.e. the information does not get erased even when power gets switched OFF and data will not be destructed until and unless, the user erases it.
    Secondary memory devices include
    Magnetic disks
    Floppy Disk
    Hard Disk Drive
    Magnetic Tape
    Optical discs
    CD
    DVD
    Blu-ray Disc
    Solid State
    Pen/Flash Drive
    Memory Card
  • Qstn #9
    Differentiate between a flash drive and a memory card.
    Ans : Difference between a flash drive and a memory card are as follows :
    Flash Drive Memory Card
    It is a small and portable data storage device. It is small, re-recordable, easily portable and very light weighted.
    It is used to store information and transfer data from one computer to another. It is commonly used in electronic devices including digital camera, mobile phones etc.
    It is available with storage different capacities upto 256 GB. It is available with storage capacity from 2 MB to 128 GB.
  • Qstn #10
    Which one of the magnetic storage disk is also known as diskette? Explain it with its advantages and disadvantages.
    Ans : Floppy disk drive is also known as diskette or FDD.
    It is a computer disk drive that enables a user to save data on removable diskettes.
    This portable storage device is a rewritable media that can be reused number of times.
    It is made of plastic with magnetic coating on it and round in shape which is covered by square plastic jacket. It is commonly used to move files between different computers. Although, 8″ disk drives made available in 1971 were the first real disk drives, the first widely used floppy disk drives were the 4″,
    5 1/4″ floppy disk drives, which were later replaced with 3 1/2″ floppy disk drives. However, today these drives are being replaced with CD-R and other writable disc drives and flash drives.
    Advantages of a Floppy Disk
    Small and light weighted.
    Inexpensive and reusable.
    Information is retrieved or accessed only sequentially.
    Disadvantages of a Floppy Disk
    Can easily be broken or damaged and not much reliable.
    Quite slow to access and retrieve data.
    Easily affected by heat
  • Qstn #11
    Describe the main applications of a computer.
    Ans : Now-a-days, computer has been employed in almost all the aspects of professional and personal life of human beings. Some of the areas where computers are being used are as follows:
    1. Education Computer has proved to be an excellent teacher. Educational institutes are using computers in many ways like tele-education, virtual classroom, online classes etc.
    2. Science Scientists have been long users of computer. A new adventure among scientists is the idea of a collaboratory (Internet based collaborative laboratory) in which researchers from all over the world can work together easily even at a distance.
    3. Industry Computer is used to control manufacturing systems and continuous running of the machinery. Parameters like
    temperature, pressure, volume are monitored and controlled by computers. Robotics developed with the help of computers which plays a very crucial role.
    4. Recreation and Entertainment Computers in recreation and entertainment are the ones that are divided into various categories, i.e. social, communication, sports, music and games. Thus, people look forward to the entertainment for recreation, so that they can reduce their stress and strains of their complex machined like schedules.
    5. Government Various departments of the Government use computers for their planning, controlling and law enforcement activities, e.g. budgets, weather forecasting, income tax department etc.
    6. Health Computer plays a very crucial role in this area. Activities like scanning, X-ray, tele-medicine, patient monitoring, patient records and diagnosis etc., are performed with the help of computers.
    7. Multimedia It is the field concerned with the computer controlled integration of text, graphics, drawings, animation, audio and any other media, where each type of information can be represented, stored, transmitted and processed digitally.
    8. Banking Computers are used’in banks to keep the records of customer’s accounts. It also provides online accounting facility which includes current balances, deposits, overdrafts, interest charges etc. e.g. ATM facility.
    9. Military Personnel Computers are used for the crucial tasks like determining the weather, computing the trajectories of missiles, smart weapons etc.
    10. Business Using a wide range of business software, a company’s marketing division can produce sales forecasts and devising new strategies, e.g. payroll calculations, budgeting etc.
    11. E-Commerce Traditionally, commerce is seen as the exchange or buying and selling of goods and services, which involves exchange of money and sometimes transportation of goods. Electronic commerce (E-Commerce) that takes place between businesses is referred to as Business-to-Business or B2B.
    -12. Publication Computers has made publication process an easy one. Without computer, the different parts of a publication-text, illustrations and graphics must be created individually, then cut out and pasted down to form a page layout.
  • #
    Section : D
    Application Oriented Questions
  • Qstn #1
    Suhana is to buy a new computer. She wants to use this system in her home as well as in office too. Suggest her a computer that can fulfill her requirements.
    Ans : Suhana should buy a laptop as laptops are easily portable computers and easy to use.
  • Qstn #2
    The usefulness of computers has now become a part of humanity. You cannot imagine life without them.
  • #2-i
    Do computers have Weaknesses also. If yes, then give some examples .
    Ans : Yes, computers have weaknesses. Some weaknesses of computers are lack of decision making power, zero IQ and no heuristics.
  • #2-ii
    Give some use of computers in daily life.
    Ans : Computers are used to listen to songs, send E-mail etc. in daily life.
  • Qstn #3
    Koshin, a class IX student, is learning computers. Yesterday her teacher taught a chapter about input devices and gave an assignment. Help her do so.
  • #3-i
    Which of the following statements are true about input devices?
    a) Input device is any software device.
    (b) Input device allows user to interact with computer.
    (c) Keyboard is an input device.
    (d) Input devices are not visible.
    Ans : (b) and (c) statements are true.
  • #3-ii
    Name few input devices.
    Ans : Keyboard, mouse, joystick, light pen and touch screen.
  • Qstn #4
    Sakshi is preparing a lecture on output device like monitor. Discuss.
  • #4-i
    Give some advantages of the output device ‘monitor’.
    Ans : (b) Can display text and graphics in a wide range of colors.
  • #4-ii
    Write some disadvantages also.
    Ans : (b) Unsuitable for users with visual problems.
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